:root{--bg:#f4f1ea;--paper:#fff;--ink:#181817;--muted:#6b6861;--line:#ddd8cc;--accent:#ff5a36;--dark:#171716;--lime:#c8ff70;--blue:#e8f0ff;--max:1240px}
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.section{padding:30px 0 76px}.sectionhead{display:flex;justify-content:space-between;align-items:end;gap:35px;margin-bottom:24px}.sectionhead h2{font-size:43px;line-height:1;margin:8px 0}.sectionhead p{max-width:600px;color:var(--muted)}.primer{background:white;border:1px solid var(--line);border-radius:28px;overflow:hidden}.primerbar{padding:18px 22px;background:var(--dark);color:#fff;display:flex;justify-content:space-between;align-items:center}.primerbar span{color:var(--lime);font-size:12px}.primerbody{padding:34px;display:grid;grid-template-columns:1fr .78fr;gap:28px}.primerbody h3{font-size:36px;line-height:1.05;margin:9px 0 17px}.plain{font-size:18px}.example{background:var(--blue);border-radius:15px;padding:18px;margin:20px 0}.do{background:#fff3ed;border-right:4px solid var(--accent);border-radius:12px;padding:17px}.primersteps{display:grid;gap:8px}.primerstep{border:1px solid var(--line);background:var(--bg);border-radius:12px;padding:13px;text-align:right;font-weight:800}.primerstep.active{background:var(--dark);color:#fff}.primerstep.done:after{content:" ✓";color:var(--lime)}.primernav{display:flex;justify-content:space-between;gap:10px;margin-top:23px}.primernav button{border:1px solid var(--line);background:white;border-radius:11px;padding:11px 15px;font-weight:900}.primernav button:last-child{background:var(--accent);color:white;border-color:var(--accent)}
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.routes{display:grid;grid-template-columns:repeat(2,1fr);gap:17px}.route{background:white;border:1px solid var(--line);border-radius:23px;padding:26px}.route h3{font-size:29px;line-height:1.05;margin:10px 0}.route>p{color:var(--muted)}.pathitem{display:grid;grid-template-columns:36px 1fr auto;gap:12px;align-items:center;border-top:1px solid var(--line);padding:13px 0;cursor:pointer}.pathitem:first-child{margin-top:15px}.pathnum{width:30px;height:30px;border-radius:9px;background:var(--bg);display:grid;place-items:center;font-size:11px;font-weight:900}.pathitem b{font-size:13px}.pathitem p{font-size:11px;color:var(--muted);margin:2px 0}.tag{font-size:9px;font-weight:900;border-radius:99px;background:#e3f4e8;color:#17643a;padding:5px 8px}.tag.premium{background:var(--dark);color:#fff}
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0}.casegrid{display:grid;grid-template-columns:repeat(5,1fr);gap:9px}.casepart{background:var(--bg);border-radius:13px;padding:14px}.casepart b{display:block;color:var(--accent);font-size:11px;margin-bottom:6px}.casepart p{font-size:12px;color:var(--muted);margin:0}.builder{display:grid;grid-template-columns:.9fr 1.1fr;gap:18px;align-items:start}.fieldbox{background:var(--bg);border-radius:18px;padding:21px}.fieldbox h3{font-size:25px;margin:10px 0}.why{background:white;border-radius:10px;padding:12px;font-size:13px;color:var(--muted)}textarea{width:100%;min-height:180px;border:1px solid var(--line);border-radius:11px;padding:13px;margin-top:12px;resize:vertical}.buildernav,.nav,.actions{display:flex;justify-content:space-between;gap:9px;margin-top:14px}.buildernav button,.nav button,.actions button{border:1px solid var(--line);background:white;border-radius:10px;padding:10px 13px;font-weight:900}.buildernav button:last-child,.nav 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1fr;gap:10px;margin-top:20px}.glossitem{background:var(--bg);border-radius:12px;padding:13px}.glossitem b{display:block}.glossitem span{font-size:12px;color:var(--muted)}.toast{position:fixed;bottom:22px;left:22px;background:var(--dark);color:#fff;padding:11px 15px;border-radius:10px;opacity:0;transform:translateY(8px);transition:.2s;z-index:130}.toast.show{opacity:1;transform:none}

.updatebar{display:flex;align-items:center;justify-content:space-between;gap:18px;background:#fff7d8;border:1px solid #eadb9b;border-radius:16px;padding:14px 17px;margin-bottom:18px}.updatebar b{font-size:13px}.updatebar span{font-size:12px;color:#756a3a}.stackline{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:18px}.stacknode{background:white;border:1px solid var(--line);border-radius:14px;padding:14px;position:relative}.stacknode:not(:last-child):after{content:"←";position:absolute;left:-9px;top:50%;transform:translateY(-50%);width:18px;height:18px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:10px;font-weight:900}.stacknode small{display:block;color:var(--accent);font-weight:900}.stacknode b{display:block;margin:4px 0}.stacknode span{font-size:11px;color:var(--muted)}
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.recommended{background:var(--dark);color:#fff;border-radius:28px;padding:30px}.recommended h2{font-size:41px;line-height:1;margin:8px 0 10px}.recommended>p{color:rgba(255,255,255,.65);max-width:880px}.recgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:9px;margin-top:20px}.recstep{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.13);border-radius:15px;padding:16px}.recstep small{color:var(--lime);font-weight:900}.recstep b{display:block;margin:6px 0}.recstep span{font-size:11px;color:rgba(255,255,255,.62)}.recnote{margin-top:16px;padding:13px;border-radius:12px;background:rgba(200,255,112,.1);border:1px solid rgba(200,255,112,.24);font-size:12px}
.navigator{background:white;border:1px solid var(--line);border-radius:26px;overflow:hidden}.navtop{padding:25px;border-bottom:1px solid var(--line)}.navtop h2{font-size:38px;line-height:1;margin:8px 0}.goalbuttons{display:flex;flex-wrap:wrap;gap:8px;margin-top:17px}.goalbtn{border:1px solid var(--line);background:var(--bg);border-radius:99px;padding:10px 14px;font-weight:900}.goalbtn.active{background:var(--dark);color:#fff;border-color:var(--dark)}.navresult{padding:25px;display:grid;grid-template-columns:.85fr 1.15fr;gap:25px}.resultwhy{background:var(--bg);border-radius:18px;padding:20px}.resultwhy h3{font-size:27px;margin:4px 0 9px}.resultwhy p{color:var(--muted)}.resultstack{display:grid;gap:9px}.resultrow{display:grid;grid-template-columns:34px 160px 1fr;gap:12px;align-items:center;border:1px solid var(--line);border-radius:13px;padding:12px}.resultrow .n{width:31px;height:31px;border-radius:9px;background:var(--dark);color:#fff;display:grid;place-items:center;font-weight:900}.resultrow b{font-size:13px}.resultrow span{font-size:12px;color:var(--muted)}
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.tool .status{display:inline-flex;border-radius:99px;padding:4px 8px;background:#fff3ed;color:#8b3b28;font-size:9px;font-weight:900;margin-top:9px}.tool .access{font-size:11px;color:var(--muted);margin-top:8px}.tool .best{border-right:3px solid var(--accent);padding-right:9px;margin-top:12px;font-size:12px}

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/* Library reader (bilingual free content) */
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.librarybody h2,.librarybody h3,.librarybody h4{margin:18px 0 8px}
.librarybody p{margin:10px 0}
.librarybody ul{margin:10px 22px}
.librarybody blockquote{border-inline-start:3px solid #c9a86a;padding-inline-start:12px;margin:12px 0;opacity:.85}
.librarybody pre.code{background:#111;color:#eee;padding:12px;border-radius:8px;overflow-x:auto;direction:ltr;text-align:left;font-size:13px}
.librarybody code{background:rgba(0,0,0,.08);padding:1px 5px;border-radius:4px;direction:ltr;display:inline-block}
#enNotice{max-width:1200px;margin:10px auto 0;padding:10px 16px}